Illinois Vision Certification Practice Test

A chalazion is a swelling that occurs on the eyelid, specifically resulting from a blocked oil gland. These oil glands, known as meibomian glands, are located within the eyelid and secrete oils that help lubricate the surface of the eye. When one of these glands becomes obstructed, it can lead to localized inflammation and the development of a bump, which is the chalazion.

The eyelid is the specific structure affected, as it is where the blockage and subsequent swelling occur. This condition differs from issues affecting other parts of the eye such as the cornea, iris, or retina, which are not involved in the formation of a chalazion. Understanding the correct anatomical location helps in recognizing and addressing the condition effectively.